CN107989577B - Needle valve for underwater horizontal Christmas tree - Google Patents
Needle valve for underwater horizontal Christmas tree Download PDFInfo
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- CN107989577B CN107989577B CN201711270017.9A CN201711270017A CN107989577B CN 107989577 B CN107989577 B CN 107989577B CN 201711270017 A CN201711270017 A CN 201711270017A CN 107989577 B CN107989577 B CN 107989577B
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- 241000191291 Abies alba Species 0.000 title claims abstract description 24
- 238000009434 installation Methods 0.000 claims abstract description 41
- 230000000149 penetrating effect Effects 0.000 claims abstract description 15
- 238000007789 sealing Methods 0.000 claims description 51
- 239000003566 sealing material Substances 0.000 claims description 7
- 238000003780 insertion Methods 0.000 claims description 6
- 230000037431 insertion Effects 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 235000004507 Abies alba Nutrition 0.000 description 15
- 239000012530 fluid Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/10—Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole
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- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Lift Valve (AREA)
Abstract
The invention discloses a needle valve for an underwater horizontal Christmas tree, which comprises a valve seat, a valve body, a valve cover, a needle valve and an ejector rod, and is characterized in that: the valve seat, the valve body and the valve cover are sequentially stacked and fixedly connected, and an installation chamber is arranged in the valve seat, the valve body and the valve cover in a penetrating manner along the stacking direction; the mounting chamber is provided with a through hole for the ejector rod to penetrate out at the outer end of the valve cover; the valve needle and the ejector rod are sequentially arranged from front to back along the length direction of the mounting cavity; the front end of the valve needle is of a conical tip-shaped structure; the rear section of the valve needle is a valve rod, the front section of the valve rod is positioned in an installation cavity in the valve body, and the rear end of the valve rod is positioned in the installation cavity in the valve cover; the front section of the ejector rod is positioned in the mounting cavity in the valve cover, the front end of the ejector rod is connected with the rear end of the valve rod, and a thread pair is arranged between the outer side surface of the front section of the ejector rod and the inner side surface of the mounting cavity in the valve cover. The needle valve for the underwater horizontal Christmas tree has the advantages of simple and reliable structure, small volume and simple use.
Description
Technical Field
The invention belongs to the field of fluid conveying control systems in underwater horizontal Christmas trees, and particularly relates to a needle valve for an underwater horizontal Christmas tree.
Background
The needle valve (the valve plug is the aciculiform) is a micromatic valve, and the micromatic valve requires that the valve port opens grow gradually to can finely tune the flow of pipeline. The underwater horizontal Christmas tree is provided with a large number of pipelines which need to control flow by installing needle valves, however, the underwater horizontal Christmas tree, oil outlet pipelines, oil pipelines and the like are buried (laid) underwater, the underwater environment has the advantages of high pressure and severe environment, and the requirements on the reliability and the service life of the needle valves are extremely high.
The existing needle valves for underwater horizontal Christmas trees are all controlled by a hydraulic system, so that a corresponding hydraulic cavity and a driving piston are required to be arranged in the needle valve to control the opening and closing of the needle valve. However, the needle valve controlled by the hydraulic system can increase the volume and the structural complexity of the needle valve, the use difficulty is high, and the reliability and the service life are difficult to guarantee durably.
Based on the above, the applicant considers to design a needle valve for the underwater horizontal Christmas tree, which has a simple and reliable structure, a small volume and simple use.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problems to be solved by the invention are as follows: how to provide a needle valve for horizontal production tree under water that simple structure is reliable, small in size, simple to use.
In order to solve the technical problems, the invention adopts the following technical scheme:
a needle valve for horizontal production tree under water, including disk seat, valve body, valve gap, needle and ejector pin, its characterized in that:
the valve seat, the valve body and the valve cover are sequentially stacked and fixedly connected, an installation chamber is arranged in the valve seat, the valve body and the valve cover in a penetrating mode along the stacking direction, and a sealing gasket ring is arranged between any two adjacent side faces of the valve seat, the valve body and the valve cover;
a penetrating hole for the ejector rod to penetrate out is formed in the mounting cavity and located at the outer end of the valve cover, an input hole for a medium to enter is formed in the mounting cavity and located at the outer end of the valve seat, and the inner side surface of the input hole is a conical cylindrical surface with the inner diameter gradually reduced from inside to outside; an output hole for outputting a medium is arranged on the side wall of the valve seat surrounding the mounting chamber in a penetrating manner;
the valve needle and the ejector rod are sequentially arranged from front to back along the length direction of the mounting cavity;
the front end of the valve needle is a conical tip-shaped structure which is positioned in an installation cavity in the valve seat and the tip of the valve needle is opposite to the input hole; the rear section of the valve needle is a valve rod, the front section of the valve rod is positioned in an installation cavity in the valve body, and the rear end of the valve rod is positioned in the installation cavity in the valve cover;
the front section of the ejector rod is located in the mounting cavity in the valve cover, the front end of the ejector rod is connected with the rear end of the valve rod, a thread pair is arranged between the outer side face of the front section of the ejector rod and the inner side face of the mounting cavity in the valve cover, the outer side face of the rear section of the ejector rod is connected with the inner side face of the through hole in a sliding sealing fit mode, and the rear end of the ejector rod is located outside the valve cover and forms an operation end.
The needle valve for the underwater horizontal Christmas tree has the following advantages:
1. simple structure is reliable, small in size, and the assembly is got up simply high-efficiently, and the reason is:
the valve seat, the valve body and the valve cover are sequentially stacked and fixed, and the valve seat, the valve body and the valve cover are internally provided with an installation chamber along the stacking direction to install the valve needle and the ejector rod. Therefore, the inner parts of the valve seat, the valve body and the valve cover can be fully utilized to process and install the chamber, and the small volume of the needle valve is ensured; the common structural strength of the valve seat, the valve body and the valve cover can be utilized to ensure the integral structural strength of the needle valve, so that the firmness and reliability of the integral structure of the needle valve are ensured.
In addition, through the structure that the valve seat, the valve body and the valve cover are sequentially stacked and fixed, when the valve seat, the valve body and the valve cover are scattered, the valve needle is quickly inserted in the valve body, the ejector rod is quickly inserted in the valve cover, and then the front end of the ejector rod is connected with the rear end of the valve needle; and finally, the valve seat, the valve body and the valve cover are sequentially stacked and fixed to complete the assembly of the needle valve, so that the assembly is simpler and more efficient.
2. The operation is simple, and the reason is as follows: the structure that "there is the screw thread pair between the medial surface of the installation cavity in the lateral surface of the anterior segment of ejector pin and the valve gap" is simpler, when guaranteeing that the needle valve volume is more small and exquisite, only need make the ejector pin rotatory can make ejector pin along its axial displacement through rotatory control end to control the switch of needle valve conveniently, so it is also more convenient to use.
Preferably, the parts of the valve seat, the valve body and the valve cover beside the installation chamber are provided with bolt connecting holes in a penetrating manner along the length direction of the installation chamber, and connecting bolts are spirally connected in the bolt connecting holes to fixedly connect the valve seat, the valve body and the valve cover.
By adopting the bolt connecting hole and the connecting bolt, the valve seat, the valve body and the valve cover can be fixed together after the connecting bolt is screwed in the bolt connecting hole, so that the structure of the fixed connection among the valve seat, the valve body and the valve cover is simpler, the assembly and the connection are more convenient, and the assembly efficiency is further improved.
Preferably, the front end of the valve body is provided with an insertion cylinder inserted into the mounting cavity in the valve seat, and the inner side surface of the insertion cylinder is a conical cylinder profile surface with the inner diameter gradually increasing from inside to outside;
the valve needle is provided with a sealing surface matched with the conical cylinder molded surface, the sealing surface is the outer side surface of the rear section of the valve needle positioned in the valve seat, and the sealing surface can be matched with the conical cylinder molded surface to form sealing when the valve needle is retracted to the bottom.
The setting of the plug-in cylinder of above-mentioned valve body not only can insert through a plug-in cylinder and carry out the primary localization in the disk seat, and the help promotes assembly efficiency. And the sealing surface of the valve needle is matched with the conical cylinder profile to form sealing (the valve port opening amount is maximum), so that the sealing property between the valve seat and the valve body is improved.
Preferably, the sealing backing ring is a BX backing ring.
The BX backing ring is a metal backing ring, and has high pressure bearing and sealing performance. When the gasket ring groove is used, the outer ring and the inner ring can be in contact with the outer side face or the inner side face of the gasket ring groove to form pretightening force when the gasket ring groove is under high pressure, and the sealing performance of the inner side or the outer side when the gasket ring groove is under high pressure is ensured.
Preferably, the rear end of the valve rod is a T-shaped joint, and the front end of the ejector rod is an L-shaped hook-shaped structure for hooking the T-shaped joint.
The connecting structure between the valve needle and the ejector rod is simple in structure and easy to realize quick assembly; the movement amount of the valve needle can be accurately controlled through the L-shaped hook and the T-shaped joint, so that the size of the valve port of the needle valve can be accurately controlled.
Preferably, a pressure balance through hole penetrates through the front end face of the ejector rod along the length direction of the ejector rod, and the pressure balance through hole communicates cavities in the valve cover, located on the two sides of the thread pair in the length direction of the ejector rod.
The pressure balance through hole is formed, so that the cavity of the valve cover, which is located in the length direction of the ejector rod, in the thread pair is communicated to realize pressure balance, the situation that the ejector rod is difficult to move due to unbalanced pressure is prevented, and the ejector rod can be ensured to rotate and move more durably and reliably.
Preferably, a valve rod sealing structure is arranged in the mounting cavity in the valve body, and the valve rod sealing structure comprises a check ring, a limiting check ring, a first-stage seal and a second-stage seal;
the inner diameter of the inner front side end of the valve cover is smaller than the inner diameter of the inner rear side end of the valve body, and a limiting step is formed; the whole check ring is of an annular structure sleeved on the valve rod, the rear end face of the check ring is abutted against the limiting step, a limiting groove is formed in the side face of the middle position in the length direction of the installation cavity in the valve body in a concave mode, and the outer side end of the limiting check ring is inserted in the limiting groove;
and a gap between the valve rod and the valve body on the front side of the limiting blocking ring is filled with a sealing material to form the first-stage seal, and a gap between the valve rod and the valve body between the limiting blocking ring and the check ring is filled with a sealing material to form the second-stage seal.
The two-stage sealing arrangement can obviously enhance the sealing at the valve rod and improve the pressure resistance inside and outside the needle valve.
Preferably, the front end face of the first stage seal is provided with a V-shaped groove.
When a medium enters the position of the lip (the middle of the V-shaped groove) and generates pressure, tension is formed, so that the outer side surface of the V-shaped groove is connected with the corresponding sealing surface in a sealing and clinging manner, and the sealing effect is enhanced.
Preferably, the side wall of the through hole is provided with a sealing groove, and a BA sealing ring is arranged in the sealing groove.
Therefore, the BA sealing ring has the advantages of being strong in abrasion resistance, easy to install, high-pressure resistant and the like, and the ejector rod and the penetrating hole can have a more reliable sealing structure after the sealing structure is adopted, so that seawater is prevented from entering the hole.
Preferably, the needle valve for the underwater horizontal Christmas tree further comprises a bolt for installing the needle valve and an assembling hole; the valve seat, the valve body and the valve cover are arranged in the mounting cavity in a penetrating mode along the length direction of the mounting cavity, the pin valve is mounted in the mounting hole through a bolt inserted into the mounting hole, the bolt head of the pin valve is limited in the valve cover, one end, far away from the bolt head, of the pin valve is mounted in the bolt and penetrates through the mounting hole and is exposed.
When adopting above-mentioned bolt for needle valve installation and pilot hole to come fixed mounting needle valve, not only can come fixed connection to needle valve installation department through the one end of keeping away from the bolt head on the bolt for needle valve installation, can also further compress tightly disk seat, valve body and valve gap through the bolt head of bolt for needle valve installation, further strengthen the reliability of the connection between the three.
Compared with the prior art, the needle valve for the underwater horizontal Christmas tree has the following advantages:
1. the valve cover and the valve body are fixed on the valve seat through the connecting bolts, so that the valve has the advantages of simple and reliable structure and easiness in assembly; the adjacent side surfaces of the valve cover, the valve body and the valve seat are sealed by the BX backing ring, so that the reliability is high and the service life is long.
2. The front end of the valve needle and the conical surface of the valve seat can form metal-to-metal sealing, and the inverted conical surface of the valve needle and the conical surface of the valve body can form inverted sealing.
3. The ejector rod is connected with the valve needle through a T-shaped structure and an L-shaped hook, and a thread pair is arranged between the ejector rod and the valve cover; the valve rod is rotated to drive the valve needle to move, so that the opening or closing of the valve port of the needle valve is realized.
Drawings
Fig. 1 is a sectional view of a needle valve for a subsea horizontal christmas tree according to the present invention.
FIG. 2 is a schematic view of a three-dimensional structure of the needle valve for an underwater horizontal Christmas tree, which is connected with an ROV interface and an extension rod.
Fig. 3 is an enlarged view at the ROV interface.
Labeled as:
1, valve seat: 101 input aperture, 102 output aperture;
2, valve body: 21 inserting cylinder, 22 retaining ring, 23 limiting retaining ring, 24 first-stage sealing and 25 second-stage sealing;
3, valve cover;
4, mounting a bolt for the needle valve;
5BX backing ring;
6, a valve needle;
7, a mandril: 71 pressure balance through holes;
8, connecting a bolt;
9BA sealing ring;
10 extending the rod;
11ROV interface: 12 pointers.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings. Where descriptive terms such as upper, lower, left, right, etc., are used for descriptive purposes to aid the reader's understanding and are not intended to be limiting.
As shown in figures 1 to 3 of the drawings,
in this embodiment, the end where the valve seat 1 is located is the front end, and the end where the valve cover 3 is located is the rear end.
The needle valve for the underwater horizontal Christmas tree comprises a valve seat 1, a valve body 2, a valve cover 3, a needle 6 and a mandril 7, wherein the valve seat 1, the valve body 2 and the valve cover 3 are sequentially stacked and fixedly connected, an installation chamber is arranged in the valve seat 1, the valve body 2 and the valve cover 3 in a penetrating mode along the stacking direction, and a sealing gasket ring is arranged between any two adjacent contact side surfaces among the valve seat 1, the valve body 2 and the valve cover 3;
an outlet hole for the ejector rod 7 to penetrate out is formed in the mounting cavity and located at the outer end of the valve cover 3, an input hole 101 for a medium to enter is formed in the mounting cavity and located at the outer end of the valve seat 1, and the inner side surface of the input hole 101 is a conical cylindrical surface with the inner diameter gradually reduced from inside to outside; an output hole 102 for outputting media is arranged on the side wall of the valve seat 1 surrounding the installation chamber in a penetrating manner;
the valve needle 6 and the ejector rod 7 are sequentially arranged from front to back along the length direction of the mounting cavity;
the front end of the valve needle 6 is a conical tip-shaped structure which is positioned in an installation cavity in the valve seat 1 and the tip of the conical tip-shaped structure is opposite to the input hole 101; the rear section of the valve needle 6 is a valve rod 61, the front section of the valve rod 61 is positioned in an installation cavity in the valve body 2, and the rear end of the valve rod 61 is positioned in an installation cavity in the valve cover 3;
the front section of the ejector rod 7 is located in an installation cavity in the valve cover 3, the front end of the ejector rod 7 is connected with the rear end of the valve rod 61, a thread pair is arranged between the outer side surface of the front section of the ejector rod 7 and the inner side surface of the installation cavity in the valve cover 3, the outer side surface of the rear section of the ejector rod 7 is connected with the inner side surface of the through hole in a sliding sealing fit mode, and the rear end of the ejector rod 7 is located outside the valve cover 3 and forms an operation end.
In the implementation process, the thread pair between the ejector rod 7 and the valve cover 3 is in threaded connection with 1-3/8-6 UN. The control end of the mandril 7 on the needle valve of the invention is connected with an ROV interface 11 through an extension rod 10 to transmit the rotation torque, so that the needle valve can be rotationally controlled by an ROV (underwater robot), the rotation number is 3/4 circles, and a pointer 12 which is convenient for the ROV to observe and is used for indicating the position is arranged in the ROV interface 11.
Bolt connecting holes are formed in the parts, beside the installation cavity, of the valve seat 1, the valve body 2 and the valve cover 3 in a penetrating mode along the length direction of the installation cavity, and connecting bolts 8 are spirally connected in the bolt connecting holes to enable the valve seat 1, the valve body 2 and the valve cover 3 to be fixedly connected.
In practice, it is preferable that the bolt coupling holes are at least two bolt coupling holes arranged at regular intervals in the circumferential direction of the installation chamber.
The front end of the valve body 2 is provided with an insertion cylinder 21 inserted into an installation cavity in the valve seat 1, and the inner side surface of the insertion cylinder 21 is a conical cylinder profile with the inner diameter gradually increasing from inside to outside;
the valve needle 6 has a sealing surface which is matched with the conical cylinder molded surface, the sealing surface is the outer side surface of the rear section of the valve needle 6 which is positioned in the valve seat 1, and the sealing surface can be matched with the conical cylinder molded surface to form sealing when the valve needle 6 retreats to the bottom.
Wherein, the sealing backing ring is a BX backing ring 5.
The rear end of the valve rod 61 is a T-shaped joint, and the front end of the ejector rod 7 is an L-shaped hook-shaped structure for hooking the T-shaped joint.
A pressure balance through hole 71 penetrates through the front end face of the ejector rod 7 along the length direction of the ejector rod 7, and the pressure balance through hole 71 communicates cavities in the valve cover 3, which are located on the two sides of the thread pair in the length direction of the ejector rod 7. The pressure balance through hole 71 realizes the communication of the upper cavity and the lower cavity of the thread pair, thereby realizing the pressure balance of the two cavities and preventing hydraulic locking.
A valve rod 61 sealing structure is arranged in an installation cavity in the valve body 2, and the valve rod 61 sealing structure comprises a retaining ring 22, a limiting retaining ring 23, a first-stage seal 24 and a second-stage seal 25;
the inner diameter of the inner front side end of the valve cover 3 is smaller than the inner diameter of the inner rear side end of the valve body 2, and a limiting step is formed; the check ring 22 is integrally of an annular structure sleeved on the valve rod 61, the rear end face of the check ring 22 is abutted against the limiting step, a limiting groove is formed in the side face of the valve body 2 at the middle position in the length direction of the installation chamber in a concave manner, and the outer side end of the limiting check ring 23 is inserted in the limiting groove;
the first-stage seal 24 is formed by filling and arranging a sealing material in a gap between the valve rod 61 and the valve body 2 on the front side of the limit stop ring 23, and the second-stage seal 25 is formed by filling and arranging a sealing material in a gap between the valve rod 61 and the valve body 2 between the limit stop ring 23 and the retainer ring 22.
In practice, the preferred sealing material is a packing seal.
Wherein the front end face of the first stage seal 24 is provided with a V-shaped groove.
Wherein, the lateral wall of wearing the hole is provided with the seal groove, be provided with BA sealing washer 9 in the seal groove.
In practice, it is preferable that the sealing grooves are at least two arranged at intervals along the axial direction of the through hole.
The needle valve for the underwater horizontal Christmas tree further comprises a bolt 4 for installing the needle valve and an assembling hole; the other part of disk seat 1, valve body 2 and valve gap 3 at the installation cavity runs through along the length direction of this installation cavity and is provided with the pilot hole, 4 cartridge of bolt for the needle valve installation are in the pilot hole, the bolt head of bolt 4 is spacing for the needle valve installation in valve gap 3 department, the one end of keeping away from the bolt head on the bolt 4 for the needle valve installation runs through the pilot hole and exposes.
The needle valve can be used for isolating injected fluid, control hydraulic pressure and test fluid in an underwater horizontal Christmas tree and is used as an isolating valve of GTV, THV, BPST, SCSSV, ICVC and ICVO. The needle valve has rated working pressure of 10000 psi. The needle valve is connected with a tree body (or other safety main bodies) by a bolt 4 for needle valve assembly, and a sealing gasket ring between the needle valve and the tree body is BX 151.
When the needle valve is used:
when the ejector rod 7 is rotated clockwise, the thread pair between the ejector rod and the valve cover drives the ejector rod to move downwards to push the valve needle to close the needle valve.
When the ejector rod 7 is rotated anticlockwise, the thread pair between the ejector rod and the valve cover drives the ejector rod to move upwards, and the valve needle is pulled to open the needle valve.
The end part of the ejector rod 7 is provided with a connecting hole, so that the ejector rod is conveniently connected with an external ROV operation cylinder.
The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the technical solution, and the technical solution of the changes and modifications should also be considered as falling within the scope of the claims.
Claims (7)
1. A needle valve for horizontal production tree under water, including disk seat, valve body, valve gap, needle and ejector pin, its characterized in that:
the valve seat, the valve body and the valve cover are sequentially stacked and fixedly connected, an installation chamber is arranged in the valve seat, the valve body and the valve cover in a penetrating mode along the stacking direction, and a sealing gasket ring is arranged between any two adjacent side faces of the valve seat, the valve body and the valve cover;
the front end of the valve body is provided with an insertion cylinder inserted into an installation cavity in the valve seat, and the inner side surface of the insertion cylinder is a conical cylinder profile surface with the inner diameter gradually increasing from inside to outside;
the valve needle is provided with a sealing surface matched with the conical cylinder molded surface, the sealing surface is the outer side surface of the rear section of the valve needle positioned in the valve seat, and the sealing surface can be matched with the conical cylinder molded surface to form sealing when the valve needle is retracted to the bottom;
a penetrating hole for the ejector rod to penetrate out is formed in the mounting cavity and located at the outer end of the valve cover, an input hole for a medium to enter is formed in the mounting cavity and located at the outer end of the valve seat, and the inner side surface of the input hole is a conical cylindrical surface with the inner diameter gradually reduced from inside to outside; an output hole for outputting a medium is arranged on the side wall of the valve seat surrounding the mounting chamber in a penetrating manner;
the valve needle and the ejector rod are sequentially arranged from front to back along the length direction of the mounting cavity;
the front end of the valve needle is a conical tip-shaped structure which is positioned in an installation cavity in the valve seat and the tip of the valve needle is opposite to the input hole; the rear section of the valve needle is a valve rod, the front section of the valve rod is positioned in an installation cavity in the valve body, and the rear end of the valve rod is positioned in the installation cavity in the valve cover; the rear end of the valve rod is a T-shaped joint, and the front end of the ejector rod is of an L-shaped hook structure for hooking the T-shaped joint;
the front section of the ejector rod is positioned in the mounting cavity in the valve cover, the front end of the ejector rod is connected with the rear end of the valve rod, a thread pair is arranged between the outer side surface of the front section of the ejector rod and the inner side surface of the mounting cavity in the valve cover, the outer side surface of the rear section of the ejector rod is connected with the inner side surface of the through hole in a sliding sealing fit manner, and the rear end of the ejector rod is positioned outside the valve cover and forms an operation end; and a pressure balance through hole penetrates through the front end surface of the ejector rod along the length direction of the ejector rod, and the pressure balance through hole communicates the cavity of the valve cover, which is positioned in the two sides of the thread pair in the length direction of the ejector rod.
2. The needle valve for an underwater horizontal Christmas tree of claim 1, wherein: the valve seat, the valve body and the valve cover are provided with bolt connecting holes in the length direction of the mounting chamber in a penetrating manner, and connecting bolts are spirally connected in the bolt connecting holes to enable the valve seat, the valve body and the valve cover to be fixedly connected.
3. The needle valve for an underwater horizontal Christmas tree of claim 1, wherein: the sealing backing ring is a BX backing ring.
4. The needle valve for an underwater horizontal Christmas tree of claim 1, wherein: a valve rod sealing structure is arranged in an installation cavity in the valve body and comprises a check ring, a limiting stop ring, a first-stage seal and a second-stage seal;
the inner diameter of the inner front side end of the valve cover is smaller than the inner diameter of the inner rear side end of the valve body, and a limiting step is formed; the whole check ring is of an annular structure sleeved on the valve rod, the rear end face of the check ring is abutted against the limiting step, a limiting groove is formed in the side face of the middle position in the length direction of the installation cavity in the valve body in a concave mode, and the outer side end of the limiting check ring is inserted in the limiting groove;
and a gap between the valve rod and the valve body on the front side of the limiting blocking ring is filled with a sealing material to form the first-stage seal, and a gap between the valve rod and the valve body between the limiting blocking ring and the check ring is filled with a sealing material to form the second-stage seal.
5. The needle valve for an underwater horizontal Christmas tree of claim 4, wherein: the front end face of the first-stage seal is provided with a V-shaped groove.
6. The needle valve for an underwater horizontal Christmas tree of claim 1, wherein: the lateral wall of wearing the hole is provided with the seal groove, be provided with the BA sealing washer in the seal groove.
7. The needle valve for an underwater horizontal Christmas tree of claim 1, wherein: the needle valve mounting device also comprises a bolt for mounting the needle valve and a mounting hole; the valve seat, the valve body and the valve cover are arranged in the mounting cavity in a penetrating mode along the length direction of the mounting cavity, the pin valve is mounted in the mounting hole through a bolt inserted into the mounting hole, the bolt head of the pin valve is limited in the valve cover, one end, far away from the bolt head, of the pin valve is mounted in the bolt and penetrates through the mounting hole and is exposed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711270017.9A CN107989577B (en) | 2017-12-05 | 2017-12-05 | Needle valve for underwater horizontal Christmas tree |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711270017.9A CN107989577B (en) | 2017-12-05 | 2017-12-05 | Needle valve for underwater horizontal Christmas tree |
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| CN107989577A CN107989577A (en) | 2018-05-04 |
| CN107989577B true CN107989577B (en) | 2020-04-07 |
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| CN201711270017.9A Active CN107989577B (en) | 2017-12-05 | 2017-12-05 | Needle valve for underwater horizontal Christmas tree |
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| CN105257829A (en) * | 2015-10-15 | 2016-01-20 | 上海市计量测试技术研究院 | Ultrahigh-pressure stop valve |
| CN107237892A (en) * | 2017-04-25 | 2017-10-10 | 甘肃天恩重工科技有限公司 | A kind of improved high-voltage needle-valve and its quick change method |
| CN207526457U (en) * | 2017-11-29 | 2018-06-22 | 重庆前卫科技集团有限公司 | Underwater horizontal type production tree |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3074288B2 (en) * | 1998-12-25 | 2000-08-07 | 日本空圧システム株式会社 | Needle valve |
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2017
- 2017-12-05 CN CN201711270017.9A patent/CN107989577B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102644760A (en) * | 2012-04-26 | 2012-08-22 | 西南石油大学 | Sealing structure of ultrahigh-pressure needle valve |
| CN203979423U (en) * | 2014-07-03 | 2014-12-03 | 凯瑞特阀业有限公司 | A kind of throttling stop valve |
| CN204677160U (en) * | 2015-03-30 | 2015-09-30 | 南京伟业机械有限公司 | The adjustable Angle Throttle Valves of a kind of gas production wellhead |
| CN105257829A (en) * | 2015-10-15 | 2016-01-20 | 上海市计量测试技术研究院 | Ultrahigh-pressure stop valve |
| CN107237892A (en) * | 2017-04-25 | 2017-10-10 | 甘肃天恩重工科技有限公司 | A kind of improved high-voltage needle-valve and its quick change method |
| CN207526457U (en) * | 2017-11-29 | 2018-06-22 | 重庆前卫科技集团有限公司 | Underwater horizontal type production tree |
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| CN107989577A (en) | 2018-05-04 |
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